Honest comparisons.
Not marketing slides.
We tested HumanGPT against five popular alternatives on the same writing samples, with the same detectors, on the same week. Each comparison page below tells you what the other tool does well, where it falls short, and why we still think HumanGPT is the better default.
The table you can open before you click through.
| HumanGPT | Undetectable.ai | Quillbot | StealthWriter | |
|---|---|---|---|---|
| Free daily allowance | 200 words/day | Limited preview | 125 words/paraphrase | Limited |
| Lifetime plan | $199 one-time | Not offered | Not offered | Not offered |
| Monthly price | $10 | $9.99-$19 | $9.95+ | $14.99+ |
| Languages tuned by natives | 30+ | Limited | Translation-style | Limited |
| Voice profiles | 10 | 3-4 | Tone presets | Few |
| Reading levels | 4 (HS, Uni, PhD, Journ.) | Not exposed | Not exposed | Not exposed |
| Frozen keywords | Yes | Limited | No | Limited |
| Built-in 7-detector check | Yes, in one click | Single detector | No | Single detector |
| API access | Yes (Pro) | Yes | Yes | Limited |
| No-signup free tier | Yes | No | No | No |
Numbers reflect public pricing pages and our own tests as of May 2026. We re-check every six weeks; if anything below has changed, please email [email protected] and we'll fix it.
Pick the one you were already considering.
HumanGPT vs Undetectable.ai
open ↗The household-name competitor. Strong on bypass, expensive monthly, no lifetime option, fewer languages.
HumanGPT vs Quillbot
open ↗A paraphraser, not a humanizer. Great for synonym swaps, weak against modern detectors like Originality and GPTZero.
HumanGPT vs Humanize.io
open ↗Closest stylistic peer. We took inspiration from their editorial design, but our tier is freer and our language coverage is wider.
HumanGPT vs StealthWriter
open ↗Focused humanizer with limited modes. HumanGPT offers more voice profiles, more languages, and a richer free tier.
HumanGPT vs Phrasly
open ↗Newer, fewer features, smaller language coverage. Direct comparison favors HumanGPT on every measurable axis.
The fastest way to compare any humanizer is to paste the same paragraph into both and read the output.
Try HumanGPT free